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Magnetic nanocomposites of CoFe 2 -CoFe 2 O 4 were synthesized using the borohydride reduction process in a chitosan solution of FeCl 2 ·4H 2 O and CoCl 2 ·6H 2 O. The chemical crosslinking favored the formation of cobalt ferrite in the nanoparticle synthesis process. The phase structure, particle size, morphology and magnetization of the nanoparticles were investigated by X-ray diffraction (XRD), Mossbauer spectroscopy (MS), scanning electron microscopy, and vibrating sample magnetoscopy, respectively. The XRD results showed that the samples are mostly made up of amorphous phases and MS shows that the phases are Fe-B. The average size of the nanoparticles obtained varied within a range of 4–13 nm. Different magnetic behavior such as ferromagnetism, spin glass and exchange-spring were observed in the nanocomposites depending on the quantify of CoFe 2 O 4 .

Layer-by-layer (LbL) films have been produced with poly(o-ethoxyaniline) (POEA), chitosan and chitosan-poly(methacrylic acid) (CS-PMAA) nanoparticles. Because the adsorption of LbL films depends on ionic interactions and H-bonding, optimized conditions had to be established for the growth of multilayer films. Unusually thick films were obtained for POEA and CS-PMAA, thus demonstrating the importance of using chitosan in the form of nanoparticles. These nanostructured films were deposited on chromium electrodes to form a sensor array (electronic tongue) based on impedance spectroscopy. This system was used to detect copper ions in aqueous solutions

Layer-by-layer (LbL) films have been produced with poly(o-ethoxyaniline) (POEA), chitosan and chitosan-poly(methacrylic acid) (CS-PMAA) nanoparticles. Because the adsorption of LbL films depends on ionic interactions and H-bonding, optimized conditions had to be established for the growth of multilayer films. Unusually thick films were obtained for POEA and CS-PMAA, thus demonstrating the importance of using chitosan in the form of nanoparticles